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Plastics by the Numbers PowerPoint PPT Presentation

Plastics by the Numbers. Recycling plastics, types of plastics, and the sorting of plastics. One Word: Plastics. What comes to your mind when you hear the word plastic? How often do you use plastic water or soda bottles? http://www.youtube.com/watch?v=5-wq9ZCQp4U.

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Plastics by the Numbers

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After-Lab Discussion

How might the properties of these plastics affect their uses or safety?

Diverse Properties

Properties affect the use and safety of each plastic type

Plastics to avoid:

Polyvinyl chloride (PVC)

considered the most damaging of all plastics

releases carcinogenic dioxins into environment when manufactured

Polystyrene (PS)

can leach styrene, a possible

human carcinogen

Safer Plastics!

PET, or polyethylene terephthalate

-considered among the safest plastics

-but still not safe to use for water bottles!

High-Density Polyethylene (HDPE)

Used in some reusable sports bottles,

but still leak some chemicals!

WHAT DO YOU THINK THE BEST CHOICE FOR A WATER BOTTLE IS?

What can plastics be recycled into?

How are plastics sorted before recycling?

Still no good way other than manually

Till the end of the class period, work on a classification key with you partner to give to the workers at the recycling facility that would help them to easily classify unmarked plastics. You can work on it together, but make sure you are doing your own!

Keep in mind the characteristics of a good classification key that we talked about earlier!

Use the paper provided

Will be due, with the worksheet, at the beginning of class on Monday

Extra credit: Type a paragraph about a new technique or invention that are currently being implemented to aid in the SORTING of plastics